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std:bit [2025/09/16 14:30] – rajitstd:bit [2025/09/16 14:32] (current) – rajit
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 </code> </code>
 This sign-extends the integer ''x'' (bitwidth ''W'') to bitwidth ''W2''. ''W2'' must be strictly larger than ''W''. This sign-extends the integer ''x'' (bitwidth ''W'') to bitwidth ''W2''. ''W2'' must be strictly larger than ''W''.
 +
  
 <code act> <code act>
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 </code> </code>
 Right rotate ''x'' by one, with the LSB of ''x'' becoming the MSB of the result. Right rotate ''x'' by one, with the LSB of ''x'' becoming the MSB of the result.
 +
 +<code act>
 +export template<pint W>  function find_msb_pos(int<W> x) : int<std::ceil_log2(W)>;
 +</code>
 +This function assumes that ''x'' is non-zero, and returns the bit position of the most significant one in ''x''.
 +
 +<code act>
 +export template<pint W> function popcount(int<W> x) : int<std::ceil_log2(W+1)>;
 +</code>
 +This function returns a count of the number of bits of ''x'' that are set to 1.
 +
  
  
  
std/bit.txt · Last modified: by rajit
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